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I removed the line that connects the threaded connection (supply side I was told ) of my mechanical fuel pump and cranked the engine. I felt a minuscule of suction I seriously doubt it was 5 psi. So I think it is clogged from the terrible gunk that clogged two fuel filters , causing me to install my current new tank
Well now I cannot get my engine to run more than the fuel I pour into the carb............
My fuel pump is new , so is there any way to clean out a sealed , non-filtered gas fuel pump
I read it does not take much trash to clog up the pump diaphragm,,,,,,,,,
No ...........no ....no the threaded side goes to the carb ..........I disconnected the other side and got no suction..........it has been a little confusing , but I THINK I have it right NOW.....
Threaded to carb & non-threaded from tank
ANYWAY , I do not have any suction from the non-threaded connection , so how to I fix this ???
This one pumps 40 gals/hour @ 7psi !!! I beleive this is too much pressure for the idle needle and engine will run too rich . I have read 5-6 psi is recommended , Salesperson said this suprecided a 4 psi that was for inside cab tank, so I will try to clean out the almost new one on truck, then find a less psi version !!!
Any advice will be appreciated.........
Whether you reuse the old one after cleaning or use a new one, a inline fuel pressure gauge is always a good idea to help diagnose any problems. Don't forget the canister unscrews and the fuel filter is inside, so cleaning should be easy.
Cleaned the almost new , clogged pump & whala , after priming in a gas can to see if it would work , it did , then hooked up NEW tank and whala again
I have been sorta in a daze ever since , like it is not real I actually have a CLEAN TANK after so many years of battling the old grunge in the ancient tank
It really is sureal and a quite joy inside me...............ha
[QUOTE=JEFFFAFA;20688028]Glad you Got R DONE there RTT.[/QUOTE
Well JEFFAFA , DAZE IS GONE & SO IS MY fuel pump
I got truck running as I posted , that was on a Friday of last week . Sunday morning it would not start and noticed fuel filter had mildly dark, cloudy gas in it !!! EVEIDENTLY i DID NOT BLOW OUT THE LINES WELL ENOUGH WITH CARB & BRAKE CLEANER
So replaced dirty filter with a new filter , disconnected fuel lines & sprayed inside of pump with brake cleaner , & no trash or dirt seemed to exit said pump . ha
Filled carb with fresh gas and runs great until gas is gone in carb & stops
When I disconnect carb fuel supply line from pump clear gas flows through the pump . Should gas flow out without cranking the engine ??? Is the diaphragm broke ?
What is mind blowing to me is clear gas is in filter & tank , and carb works & engine runs !!! Did the pump die that easy ???
What is my next move other than buying another NEW pump
HELP
If clear gas from the tank is coming out of the pump on the carb side without the engine running, that pump is hosed. Either the diaphragm is shot or the one-way check valve in the pump is. See if your supplier will warranty it for you. Just make sure it doesn't smell like brake clean. Please keep brake clean to brakes and carb cleaner to carbs.
If clear gas from the tank is coming out of the pump on the carb side without the engine running, that pump is hosed. Either the diaphragm is shot or the one-way check valve in the pump is. See if your supplier will warranty it for you. Just make sure it doesn't smell like brake clean. Please keep brake clean to brakes and carb cleaner to carbs.
First of all THANK YOU for the reply
It is not what I wanted to hear but at least I can move forward & you saved me more trouble shooting and more importantly time !!!
It is strange pump worked Fri.night & died first thing Sun.
Just when you have the answer , they change the question
Yes, there is supposed to be. The can unscrews and the filter is in there. That is the main fuel filter, unless you add an inline between the pump and the tank.
Why would you not go for the new pump with a filter? 7psi is only an estimate. So, what if you need a regulator. Problem with resurrecting and old pump has its own problems. The worst being, pumping fuel into the crank case. Originality is a pipe dream that will consume you.
Why would you not go for the new pump with a filter? 7psi is only an estimate. So, what if you need a regulator. Problem with resurrecting and old pump has its own problems. The worst being, pumping fuel into the crank case. Originality is a pipe dream that will consume you.
Pump on truck when I bought it had a fuel pump with no internal filter . Truck had a clear inline filter which is what I prefer . I was trying to resurrect an almost new fuel pump .
All pumps I see listed have the internal fuel filter !!! I want a non-internal filter pump !!! Will using a fuel pump with external inline filter matter ???
Im sure it would work since Ford went to them later. I wouldnt trust my whole fuel system on one little inline filter though. On my 70 f250, I have the two, even though my tank is still brand new inside.
Did Ford go to one little filter like that or something different when the fuel pump changed?
I forgot to mention, the old tank that was in my 70 f250 when I got it was full of crap and it went right through both of my filters and wrecked my carburetor.
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Fuel Pump Hold-Up
I seriously doubt it was 5 psi. So I think it is clogged from the terrible gunk that clogged two fuel filters , causing me to install my current new tank 
